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Failure of %pl[native] options frame, framed and etched

 
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Kenneth_Smith



Joined: 18 May 2012
Posts: 473
Location: Hamilton, Lanarkshire, Scotland.
PostPosted: Thu Dec 03, 2020 4:04 pm    Post subject: Failure of %pl[native] options frame, framed and etched Reply with quote
Paul, one for you to look at when you have the chance. In this example, the specific combination of 11 data points with x values running from -10 to 0 causes the %pl option frame to fail. The left-hand vertical frame element is not drawn. This also happens with the alternative options framed and etched.

Code:
module example
use clrwin
implicit none
integer, parameter :: dp = kind(1.d0)
integer,parameter  :: npts = 11
real(kind=dp)      :: x(1:npts) = 0.d0, y(1:npts) = 0.d0, a(1:3) = (/0.d0,0.d0,1.d0/)
real(kind=dp)      :: xmin = -10.d0, xmax = 0.d0

contains

  integer function gui()
  integer :: iw
    iw = winio@('%mn[Exit]&','exit')
    iw = winio@('%bg&',rgb@(250,250,250))
    iw = winio@('%2.1ob&')
    iw = winio@('%nl y = c*x^2 + b*x + a&')
    iw = winio@('%2nlxmin%ta%`bg[white]%8rf%2nlxmax%ta%`bg[white]%8rf&',xmin,xmax)
    iw = winio@('%2nla%ta%`bg[white]%8rf%2nlb%ta%`bg[white]%8rf%2nlc%ta%`bg[white]%8rf&',a(1),a(2),a(3))
    iw = winio@('%2nl%cn%^bb[Update plot]%cb&',plot_cb)
    call winop@('%pl[native,x_array,frame,link=curves,colour=blue,width=2,gridlines,symbol=13]')
    iw = winio@('%pl&',600,400,npts,x,y)
    iw = winio@('%cb')
    gui = 2
  end function gui

  integer function plot_cb()
  integer i
  integer :: iw
  real(kind=dp) inc
    if (xmax .le. xmin) then      ! ERROR
        iw = winio@('XMAX must be greater than XMIN%2nl%cn%bb[OK]')
        x = 0.d0 ; y = 0.d0 ; call SIMPLEPLOT_REDRAW@() ; plot_cb =2 ; return
    else                          ! NORMAL
        inc = (xmax - xmin)/dble(npts-1)
        x(1) = xmin
        do i = 2, npts, 1
          x(i) = x(i-1) + inc
        end do
        do i = 1,npts, 1
          y(i) = a(1) + x(i)*a(2) + x(i)*x(i)*a(3)
          !! print*, i, x(i), y(i)
        end do
        call SIMPLEPLOT_REDRAW@()
    end if
    plot_cb = 2
  end function plot_cb
end module example

program main
use example
i = gui()
end program main


PS There are other combinations of XMIN, XMAX, and NPTS which have this issue. XMAX = 0 is common to all of these.
Quote:
NPTS = 2, XMIN = -10, XMAX = 0
NPTS = 3, XMIN = -10, XMAX = 0
NPTS = 5, XMIN = -10, XMAX = 0
NPTS = 6, XMIN = -10, XMAX = 0
NPTS = 9, XMIN = -10, XMAX = 0
NPTS = 11, XMIN = -10, XMAX = 0
NPTS = 17, XMIN = -10, XMAX = 0
NPTS = 21, XMIN = -10, XMAX = 0
NPTS = 2, XMIN = -10.1, XMAX = 0
NPTS = 3, XMIN = -10.1, XMAX = 0
NPTS = 19, XMIN = -10.1, XMAX = 0


Last edited by Kenneth_Smith on Fri Dec 04, 2020 1:24 am; edited 1 time in total
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 6836
Location: Salford, UK
PostPosted: Thu Dec 03, 2020 4:57 pm    Post subject: Reply with quote
Ken

Thanks. I have noted this.
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 6836
Location: Salford, UK
PostPosted: Fri Apr 09, 2021 12:04 pm    Post subject: Reply with quote
Ken

I have had a look at this. Changing the limits seems to work apart from the particular case xmin = -10 where the frame is not complete unless you reduce xmin a fraction.

I am not sure that I can safely make any changes that will improve this.
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Kenneth_Smith



Joined: 18 May 2012
Posts: 473
Location: Hamilton, Lanarkshire, Scotland.
PostPosted: Sat Apr 10, 2021 12:30 pm    Post subject: Reply with quote
Paul,

I had forgotten about this one, so I guess problematic data sets don't occur that often. The solution is straightforward, draw the frame via the %pl call back - I've been using that trick recently to enhance the appearance of the plot (different colours for the frame).
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John-Silver



Joined: 30 Jul 2013
Posts: 1507
Location: Aerospace Valley
PostPosted: Mon Apr 12, 2021 3:51 am    Post subject: Reply with quote
Paul, you wrote:
Changing the limits seems to work apart from the particular case xmin = -10 where the frame is not complete unless you reduce xmin a fraction

.. but Ken had failure cases where he did reduce xmin by 'a fraction' (-0.1 to be precise)

I'm not a fan of 'reducing numbers by 'a little bit' in order to make stuff run.
That 'little bit' might be different depending on the data set in use and one ends up repeatedly changing code (in different ways)depending on the input data defined !

wot the eck can possibly be causing this ?
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